Juan, Short version - bad. Longer version - 10 or so years ago these were popular and I might still have the name of one of the guys who did the blue diamond conversions. So while there still might be a collector or two who has one in their collection, I don't think that anyone who is really serious believes that they are period. With one well known US dealer a year two back who even sold a green "Forestry" model. A fake, but at least the buyer could say he purchased it from XXXX (so it must be good). Best Regards, Fred